EVAL-AD7124-4SDZ User Guide - Analog Devices

1 EVAL- ad7124 -4 SDZ user Guide UG-855 One Technology Way P. O . Box 9106 Norwood, MA 02062-9106, Tel: Fax: Evaluation Board for the ad7124 -4 4-Channel, Low Noise, Low Power, 24-Bit, Sigma-Delta ADC with In-Amp and Reference PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 29 FEATURES Full featured evaluation board for the ad7124 -4 PC control in conjunction with the Analog Devices , Inc., System Demonstration Platform (EVAL-SDP-CB1Z) PC software for control and data analysis (time domain) Standalone capability EVALUATION KIT CONTENTS E VAL- ad7124 -4 SDZ evaluation board Evaluation software CD for the ad7124 -4 ONLINE RESOURCES Documents Needed ad7124 -4 data sheet E VAL- ad7124 -4 SDZ user Guide Required Software ad7124 -4 EVAL+ Software EQUIPMENT NEEDED E VAL- ad7124 -4 SDZ evaluation board E VAL-SDP-CB1Z System Demonstration Platform DC signal source USB cable PC running Windows with USB port GENERAL DESCRIPTION The E VA L- ad7124 -4 SDZ evaluation kit features the ad7124 -4 24-bit, low power, low noise Analog -to-digital converter (ADC).

2 A 7 V to 9 V external supply is regulated to V to supply the ad7124 -4 and to support all necessary components. The E VA L- ad7124 -4 SDZ board connects to the USB port of the PC via the connection to the E VA L-SDP-CB1Z motherboard. The ad7124 -4 EVAL+ Software fully configures the ad7124 -4 device register functionality and provides dc time domain analysis in the form of waveform graphs, histograms, and associated noise analysis for ADC performance evaluation. The E VA L- ad7124 -4 SDZ is an evaluation board that allows the user to evaluate the features of the ADC. The user PC software executable controls the ad7124 -4 over the USB through the E VA L-SDP-CB1Z System Demonstration Platform (SDP) board.

3 Full specifications on the ad7124 -4 are available in the product data sheet, which should be consulted in conjunction with this user Guide when working with the evaluation board. UG-855 EVAL- ad7124 -4 SDZ user Guide Rev. 0 | Page 2 of 29 TABLE OF CONTENTS Features .. 1 Evaluation Kit Contents .. 1 Online Resources .. 1 Equipment Needed .. 1 General Description .. 1 Revision History .. 2 E VA L- ad7124 -4 SDZ Block Diagram .. 3 E VA L- ad7124 -4 SDZ Quick Start Guide .. 4 Evaluation Board Hardware .. 5 Device Description .. 5 Hardware Link Options .. 5 Power Supplies .. 7 Serial Interface .. 7 Analog Reference Options ..8 Evaluation Board Setup Procedures ..8 Evaluation Board Software ..9 Software Installation Software Operation.

4 12 Configuration Tab .. 12 Wavefrom Tab .. 14 Histogram Tab .. 16 Register Map Tab .. 17 Noise Test Quick Start Demonstration .. 18 Evaluation Board Schematics and Artwork .. 20 Bill of Materials .. 27 REVISION HISTORY 7/15 Revision 0: Initial Version EVAL- ad7124 -4 SDZ user Guide UG-855 Rev. 0 | Page 3 of 29 EVAL- ad7124 -4 SDZ BLOCK DIAGRAM TEMPERATURESENSORBANDGAPREFVBIASSERIALIN TERFACEANDCONTROLLOGICINTERNALCLOCKCLKSC LKDINSDP-BADSP-BF527 STATUSLEDSYNCREGCAPD27k IOVDDAD7124-4 AVSSDGND24-BIT - ADCX-MUXREFIN1(+)AVDDAVSSREFOUTAVDDAVSSP SWVARIABLEDIGITALFILTERDIAGNOSTICSCOMMUN ICATIONSPOWER SUPPLYSIGNAL CHAINDIGITALREFIN1( )REFIN2(+)REFIN2( ) (+)13304-001 AIN0/IOUT/VBIASON-BOARDNOISE TESTAIN0 TO AIN1 AIN1/IOUT/VBIASAIN7/IOUT/VBIAS/REFIN2( )NOTES1.

5 FOR SIMPLICITY, DECOUPLING NOT OUTPUTGNDGNDGNDGNDIN7V TO OUTPUTGNDGNDGNDADJINOUTENGNDUSBPOWERLED Figure 1. UG-855 EVAL- ad7124 -4 SDZ user Guide Rev. 0 | Page 4 of 29 EVAL- ad7124 -4 SDZ QUICK START Guide To begin using the evaluation board, do the following: 1. With the EVAL-SDP-CB1Z board disconnected from the USB port of the PC, install the ad7124 -4 EVAL+ Software (the software is included on the CD in the evaluation kit, or it can be downloaded from the Analog Devices website). The PC must be restarted after the software installation is complete. (For complete software installation instructions, see the Software Installation Procedures section.) 2. Connect the EVAL-SDP-CB1Z board to the EVAL- ad7124 -4 SDZ board.

6 3. Screw the two boards together using the plastic screw and washer set included in the evaluation board kit to ensure that the boards are connected firmly together. 4. Apply an external voltage in the range of 7 V to 9 V to the J3 or J5 connecter of the EVAL- ad7124 -4 SDZ board. This provides the power supply for the board. 5. Connect the EVAL-SDP-CB1Z board to the PC using the supplied USB cable. If you are using Windows XP, you may need to search for the EVAL-SDP-CB1Z drivers. Choose to automatically search for the drivers for the EVAL-SDP-CB1Z board if prompted by the operating system. 6. From the Programs menu, go to the Analog Devices subfolder, and click ad7124 Eval+ to launch the ad7124 -4 EVAL+ Software (see the Launching the Software section for further details).

7 13304-002 Figure 2. Hardware Configuration, Setting Up the EVAL- ad7124 -4 SDZ Evaluation Board EVAL- ad7124 -4 SDZ user Guide UG-855 Rev. 0 | Page 5 of 29 EVALUATION BOARD HARDWARE DEVICE DESCRIPTION The ad7124 -4 is a low power, low noise, complete Analog front end for high precision measurement applications. It contains a low noise, 24-bit, - ADC. It can be configured to have four differential inputs or seven single-ended or pseudo differential inputs. The on-chip low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC. Other on-chip features include a low drift V reference, excitation currents, reference buffers, multiple filter options, and many diagnostic features.

8 Complete specifications for the ad7124 -4 are provided in the product data sheet, which should be consulted in conjunction with this user Guide when using the evaluation board. Full details about the E VA L-SDP-CB1Z are available on the Analog Devices website. HARDWARE LINK OPTIONS Ta b l e 1 lists the default link options. By default, the board is configured to operate from a wall wart (dc plug) power supply via Connector J5. The supply required for the ad7124 -4 comes from the on-board ADP1720 low dropout regulators (LDOs), which generate their voltage from J5. Table 1. Default Link and Solder Link Options Link No. Default Option Description LK1 A Connects the AVDD voltage to the power supply sequencer, ADM1185.

9 When AVDD equals V, LK1 must be in Position A. When AVDD equals V, LK1 must be in Position B. LK2 B Selects the connector for the external 7 V to 9 V power supply. In Position A, this link selects the external 7 V to 9 V power supply to come from Connector J3. In Position B, this link selects the external 7 V to 9 V power supply to come from Connector J5. LK3 Inserted Inserting this link connects REFIN( ) to AVSS. LK4 V Selects the reference source for the ADC. In Position V, REFIN1(+) is connected to the external V reference (ADR4525). In Position INT REF, REFIN1(+) is connected to the REFOUT pin of the ad7124 -4. The internal reference of the ad7124 -4 can be enabled and applied to the ad7124 -4 external to the ADC.

10 LK5 Inserted This link shorts AIN0 to AIN1. This is useful for performing noise tests on the ad7124 -4. The internal bias can be enabled on AIN0 or AIN1 so that AIN0 and AIN1 are at an appropriate voltage for the noise test. LK6 Inserted LK6 can be used to connect the AIN4 and AIN5 channels to external components such as an external amplifier. The jumpers in Position A and Position B at LK6 must be opened to include the external component on the front end. Jumper A and Jumper B of this link can be used to connect the AIN4 and AIN5 channels to external components such as an external amplifier. For this, the jumpers must be open. Having Jumper A and Jumper B in place connects AIN4 and AIN5 to on-board thermistor used for cold junction measurements.